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Colorthink Pro 3.0.3 Serial Number
Colorthink Pro 3.0.3 Serial Code
Colorthink Pro 3.0.3 Serial Number

By Chandramohan Seetharamiah Srinivasaraju

Color Management

Objective

It is critical to check the quality of ICC profiles prior to use. Sharma (2004) states: “If the quality of a profile is poor, the results are likely to be poor” (p. 325). Clearly, the ultimate test of a profile is to use it in a workflow, but such tests are expensive and tend to lead the user on a path of iterative trial-and-error, which largely defeats one of the key benefits of ICC-profile based color management. Here, a procedure for printer profile evaluation using Chromix® ColorThink Pro software is outlined, with the goal of providing readers with a step-by-step methodology for such evaluation. For more detailed information on ColorThink Pro, readers are encouraged to reference ColorWiki (Category:Manuals, n.d.) and Ashe (2014) Color Management & Quality Output, Focal Press.

Assessment of ICC profiles and color reproduction involves expertise from color science, psychophysics and image analysis. The first approach used in the present analysis evaluates the accuracy of a press profile “round-trip” test that is conducted using only the software, without costly hard copy output. Profile accuracy is defined as the color difference between what you desired (e.g.: your original image) and what you obtained, (e.g.: the reproduction). This difference is expressed in Delta-E (Sharma, 2004). Round-tripping involves conversion from device to CIELAB values (otherwise known as the inverse side, or B2A transform) and then subsequently from CIELAB back to CMYK (also known as the forward side, or A2B transform). The Delta-E difference between B2A and A2B is evaluated to see the accuracy of the reversibility (Sharma, 2005).

Chromix® ColorThink Pro is an extensive software suite of tools specifically designed for the evaluation of ICC profiles. ColorThink is an application created by Chromix®, and has many features and tools that allow the analysis of profiles, workflows and measured quality. As a workflow tool, ColorThink enables users to analyze the overall process involved in producing images and profiles from start to finish, and displays what happens to the color throughout the transforms (Ashe, 2014).

Materials and Apparatus

In this evaluation, the material and equipment utilized are as follows.

1. CMYK value of IT8/7.4 chart saved in a text file.

2. HubUncoated1_M2.icc, a custom ICC profile of a CMYK Offset Lithographic press condition on uncoated stock. This is the profile that is analyzed here, users would select their own profile for an analysis.

3. Industry standard “US Sheetfed Uncoated SWOP v2” profile.

4. A computer running ColorThink Pro software.

5. RGBXPLORER8.tif file from hutchcolor website.

6. TestForm_RGB_Flatened.tif, a custom test form consisting of images displaying highly saturated colors and detail. Users are encouraged to create their own test form for profile analysis.

Experiment

This experiment involves several steps to evaluate the profile, as outlined below.

Step 1. The following steps are used to round trip the HubUncoated1_M2.icc profile and evaluate the colorimetric values which comprise the 1,617 patch IT8/7.4 target. The goal is to evaluate resultant CIELAB values to ascertain how close the colors values are after passing though both the inverse side (B2A) and the forward side (A2B) of the profile.

1. Open ColorThink Pro, then open a new Color Worksheet.

2. Drag and drop the IT8/7.4 test chart file “HubUncoated1_M2.txt” into the Colors section. The CMYK values of each of the 1,617 patches in IT8/7.4 test chart will appear first in the Colors section, an image of the IT8/7.4 test chart appears in the Images section and “” appears in the Profiles section.

Colorthink Pro 3.0.3 Serial Number

3. Drag “HubUncoated1_M2.icc” profile on to the “” in the Profile section to assign the profile to IT8/7.4 test chart.

4. Each of the CMYK patch in the Colors section is assigned CIELAB value from the chosen profile. The CMYK patches of the IT8/7.4 test chart are converted CIELAB using forward (A2B) transform.

5. Drag the “HubUncoated1_M2.icc” profile in the Profile section and drop on the IT8/7.4 test chart into the Images section.

6. Duplicate IT8/7.4 test chart image of HubUncoated1_M2.txt, which is displayed with the HubUncoated1_M2.icc profile assigned in the Profile section.

7. Select the rendering intent for the transform: as a default, it is “Relative Colorimetric,” for the purposes of the present analysis “Absolute Colorimetric” is selected.

8.The CIELAB values obtained from A2B transform are converted to CMYK values, these values are calculated using the inverse (B2A) transform.

9. Click the Delta-E button to calculate the Delta-E values between the source CIELAB values used in A2B transform and reference CIELAB values in the subsequent B2A transform. Evaluate the Delta-E of the chart Image by looking at green, yellow, and red Delta-E tolerance range on a small popup window. Green represents tolerance of 2 Delta-E, yellow represents tolerance of 3.5 Delta-E and red represents the tolerance of 8 Delta-E, as illustrated in Figure 1.

Step 1 Results. The Delta-E values in the Colors section (Figure 2)

Colorthink Pro 3.0.3 Serial Code

are sortable, the values should be selected so that they are displayed from the largest to the smallest. As there are 1,617 patches, the 81st value represents 95th percentile, this is a good indicator of the quality of the profile. The Delta-E of the 81st patch value in this example is 1.72. The obtained Delta-E value of the 95th percentile is less than 2, which indicates the quality of profile “HubUncoated1_M2.icc” in terms of the reversibility of the output profile look up table (Myers, 2017).

In the Colors section on the left, a selection of “rpt” generates a statistical evaluation of the Delta-E round trip results. Delta-E between the B2A and A2B transforms shows that there are fourteen color patches that are near a Delta-E of 3.0; overall statistics of the round-trip test are displayed in Table 1. It is observed from Table 1 that the average overall Delta-E values for 1,617 colors is in below 1.0 Delta-E.

Step 2. To continue the evaluation, the primary and secondary colors of the “HubUncoated1_M2.icc” are compared to an industry standard profile, here, “US Sheetfed Uncoated SWOP v2” with a goal of determining if there are any significant hue shifts that could affect the color reproduction.

1. In the ColorThink Pro, select the 3D grapher to open the Plot Items window. Drag and drop the “HubUncoated1_M2.icc” on to Plot Items window. Select Plot as: “Points”, Point Set: “primaries secondaries” and enable “joint with lines”

2. Repeat the above for the “US Sheetfed Uncoated v2” profile.

Step 2 Results. Figure 3 displays the comparison of the CMY primary colors and RGB secondary colors of “HubUncoated1_M2.icc” (Red line) and “US Sheetfed Uncoated v2” (Green line). It can be observed that the ubUncoated primaries are more saturated in the magenta and yellow regions, where the US Sheetfed Uncoated primaries are saturated in the cyan region. Secondary colors of both p